Evo x FE panasonic Fuel Pump Relay - Page 2 - EvoXForums.com - Mitsubishi Lancer Evolution X Forums
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Evo X General General discussion on the 2008+ Mitsubishi Lancer Evolution X

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Old 05-19-2017, 05:27 PM   #11
dgutierrez079
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Great thanks for the responses! I ended up disconnecting the battery for peace of mind, and tested the relay with the fog lights and it was fine. Also, it seems like people haven't had any problems with the Panasonic relays so ill stick to them *fingers crossed*
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Old 05-20-2017, 06:36 PM   #12
Lightsaber
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Based on my limited understanding, Mitsubishi used the incorrect relay size for the fuel pump. Evo's fuel pump can go through a high-voltage mode and a low-voltage mode everytime you give it gas, which is hundreds, if not thousands, of cycles everyday.

For relays of that size, there are more reliable and less reliable ones. The replacement relays you get at SSP, AMS, Kaizen, or any Evo shops that know what they are doing are the more reliable ones. However, even these relays last only about a year or so. Therefore, it is the best that you change the fuel pump relay periodically.

When the fuel pump relay goes out, the fuel pump will struggle to enter high-voltage mode. The symptoms are usually random and inconsistent, so I personally believe that a wideband AFR is the best long-term solution. When you see it starts randomly running lean, you check the relay (salt-shaker method). If it's bad, change it.
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Old 05-21-2017, 10:49 AM   #13
MR. EVO MR
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Dont worry OP
I just hit 166000 miles and still have the original relays!
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